Cylinder hones



p 1957 H. B. BARRETT 2,805,528

CYLINDER HONES Filed June 8, 1956 INVENTOR. HARRY B. BARRETT ATTORNEY2,805,528 Patented Sept. .10, 1957 fiice QYLWDER BONES Harry B. Barrett,Clayton, Mo.

Application June 8, H56, Serial No. 596,29t3

11 Claims. (Cl. 51- -1842) This invention relates in general to certainnew and useful improvements in cylinder bones and, more particularly, tohoning devices adapted for use in the honing of automotive brakecylinders.

It is the primary object of this invention to provide a tool designed tofinish, smooth, polish, or abrade internal cylindrical surfaces.

It is also an object of this invention to provide a cylinder hone whichcan be easily and conveniently adjustable to fit internal cylindricalsurfaces of different diameters.

v It is another object of the present invention to provide a cylinderhone which will not damage the cylinder or surrounding mechanism if thecylinder hone is rapidly or accidentally withdrawn while still inrotation.

it is an additional object of the present invention to provide aninexpensive finishing tool which can be mounted in the chuck of anelectric drill or a similar hand tool.

With the above and other objects in view, my invention resides in thenovel features of form, construction, arrangement, and combination ofparts presently described and pointed out in the claims.

In the accompanying drawing- Fig. 1 is an elevational view of a cylinderhone;

Fig. 2 is an end view of the cylinder home as shown in Fig. 1;

Fig. 3 is an elevational view of the cylinder hone in one adjustedposition;

Fig. 4 is an end view of a cylinder hone in the adjusted position shownin Fig. 3;

Fig. 5 is a sectional view taken along line 5-5 of Fig. 3;

Fig. 6 is a transverse sectional view taken along line 66 of Fig. 5; and

Fig. 7 is a fragmentary plan view of a leaf spring member forming a partof the present invention.

Referring now in more detail and by reference characters to the drawing,which illustrates a preferred embodiment of the present invention, Adesignates a cylin der hone comprising a rod-like shaft 1 having acentral externally threaded section 2 which is turned down at one end inthe formation of a diametrically reduced smooth shank 3. At its otherend, outwardly from the threaded section, the shaft 1 is integrallyprovided with an enlarged shaft-like honing-head 4 of substantiallyhexagonal cross-sectional shape and being provided in a1- ternate flatfaces F with short outwardly projecting radial pins 5, 6, 7. Thehoning-head 4 is also ground 013? or otherwise formed along its forwardend in the provision of a blunt-pointed tapered end-section 8.

Operatively mounted on the threaded section 2 of the rod-like shaft 1 isa round nut 9 exteriorly provided with a knurled surface s to facilitatemanual rotation, as will presently more fully appear. The nut 9 alsointegrally includes a diametrally enlarged annular shoulder 10 and aforwardly extending cylindrical collar 11, which is, in

turn, provided at its outer end with a peripheral head 12.

Rotatably mounted upon and carried by the collar 11 is an adjustmentsleeve 13 having an annular indentation 14 which is adapted for endwiseabutment against the bead 12 whereby the sleeve 13 is held in assembledrelation upon the nut 9. For a substantial portion of its lengthforwardly of the indentation 14, the adjustment sleeve 13 is formed intoa hexagonal barrel 15 which is integrally provided at its open end onalternately spaced sides with radially inwardly projecting guide ears16, 17, 18, having inwardly presented arcuate margins 19, 20, 21,respectively adapted for sliding engagement against intermediate flatfaces F of the honing-head 4.

Provided for removable disposition upon the honing.- head 4 are threeidentical, spring steel honing arms 22, each being provided at its outerend with laterally projecting cars 23 and at its inner end with acircular aperture 24 adapted for loose-fitting interchangeabledisposition upon the pins 5, 6, 7.

Provided for removable and replaceable disposition upon the honing arms22 are honing-elements 25 formed of sheet metal and integrally includinga flat bight 26 marginally joined to two lateral flanges 27 and twolateral spring leaves 28, the latter extending lengthwise rearwardlyfrom the forward end of the honing-element 25 to approximately themidpoint thereof and being provided with apertures 29 for swivellingconnection with the cars 23. Cemented or otherwise rigidly aflixed tothe outer face of the bight 26 of each honing-element 25 is arectilinear abrasive stone 3! adapted for operative contact with theinternal cylindrical surface which is to be honed.

It should be noted that the aforementioned honing arms 22 are ofsubstantially the same width as the fiat faces of the honing-head 4 soas to be more or less snugly held in place by the hexagonal barrel 15.Furthermore, the hon-- ing arms 22 are longitudinally bent and temperedso as to extend outwardly and forwardly from the honing-head 4 in agentle S-shaped curve.

In use, the honing arms 22 are fitted upon the radially extending pins5, 6, 7, of the honing-head 4, and the hexagonal barrel 15 shiftedforwardly in relation thereto by manual rotation of the nut 9. Thebarrel 15 is, of course, held against rotation and caused to shiftlongitudinally by the sliding contact between the arcuate margins U, 20,21, of the guide ears 16, 17, 18, and the intermediate flat faces F ofthe honing-head 4, causing the honing-elements to operate alongprogressively smaller maximum diameters. In other words, the adjustedposition of the hexagonal barrel 15 will determine, for such position ofadjustment, the maximum diameter of the path around which the honingelements 25 can rotate when unrestrained. It will, of course, beunderstood that such diameter, at any given setting, is somewhat largerthan the actual diameter of the cylindrical surface which is to behoned.

The shank 3 of the hone A is inserted into the chuck of a conventionalelectric hand drill or similar power source. Since such power source isentirely conventional, it is not specifically shown or described herein.The adjustment sleeve 13 is then shifted into some desired position andthe honing-elements 25 manually pressed together so as to slip freelywithin the cylinder to be honed. Upon being released, the honing arms 22will spring outwardly and hold the stones 3! resiliently against thesurface being honed. Thereupon, the power source is energized and theentire cylinder hone A rotated, causing the stones 30 to slide rapidlyaround the cylindrical surface being honed.

In the event that the bone A, due to accident or misuse, should come outof the cylinder being honed while the power source is still energized,the stones 30 will fly out wardly only to the maximum diameter permittedby the adjustment sleeve 13. This restriction will prevent damage to thestones 30, as well as to surrounding mechanical elements of the cylinderassembly. It is also apparent that the stones 3%, when worn out orbroken, can be readily replaced at will.' Finally, the hone A issubstantially selfcentering in the sense that it is not necessary tomaintain the longitudinal axis of the shank 3 in precise alignment withthe longitudinal axis of the cylinder being honed.

Another important advantage and unusual operating characteristic ofbones constructed in accordance with the present invention is theability of the hone A to maintain will produce an accurate cylindricalsurface even if the shank 3 is wobbled. Thus, the swivel-likeconnections formed by the tongues 23 and apertures 29, taken togetherwith the resiliency of the arms 22 and the manner of their connection tothe honing-head 4, in etlect constitute a universal joint, so that thestones will maintain accurate axiality within the cylinder being honed.

It should be understood that changes and modifications in the form,construction, arrangement, and combination of the several parts of thecylinder hone may be made and substituted for those herein shown anddescribed without departing from the nature and principle of myinvention.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

l. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms adapted for longitudinalflexing radially of said shank and being loosely mounted upon the head,a tubular sleeve shiftably mounted upon the shank, means on the shankfor shifting the tubular sleeve axially with respect to the shank tovarious relative positions of adjustment therealong, said sleeve beingadapted, when in such shifted positions, to extend over and around endportions of the arms and bear thereagainst to limit the maximum diameterto which the outer ends of the arms can extend, and

' abrasive elements swivelly mounted on the outer ends of each of saidarms.

2. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms having a longitudinalarcuate contour and being loosely mounted upon the head, a tubularsleeve shiftably mounted upon the shank, means on the shank for shiftingthe tubular sleeve axially with respect to the shank to various relativepositions of adjustment therealong, said sleeve being adapted, when insuch shifted positions, to extend over and around end portions of thearms and bear thereagainst to limit the maximum diameter to which theouter ends of the arms can extend, and abrasive elements swivellymounted on the outer ends of each of said arms.

3. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms having a longitudinalarcuate contour and being loosely mounted upon the head, a tubularsleeve shiftably mounted upon the shank, means on the shank for shiftingthe tubular sleeve axially with respect to the shank to various relativepositions of adjustment therealong, said sleeve being adapted, when insuch shifted positions, to extend over and around end portions of thearms and bear thereagainst to limit the maximum diameter to which theouter ends of the arms'can extend, and abrasive elements removablymounted on the outer ends of each of said arms. I

4. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms formed of flat resilientblades of spring material and having a longitudinal arcuate contour,said arms being loosely mounted upon the head, a tubular sleeveshiftably mounted upon the shank; means .on the shank .for shifting thetubular sleeve axially with respect to the shank to various relativepositions of adjustment therealong, said sleeve being adapted, when insuch shifted positions, to extend over and around end portions of thearms and bear thereagainst to limit the maximum diameter to which theouter ends of the arms can extend, and abrasive elements operativelymounted on the outer ends of each of said arms.

5. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms formed of flat resilientblades of spring steel and having a longitudinal arcuate contour, saidarms being loosely mounted upon the head,'a tubular sleeve shiftablymounted upon the shank, means on the shank for shifting the tubularsleeve axially with respect to the shank to various 7 relative positionsof adjustment therealong, said sleeve eing adapted, when in such shiftedpositions, to'extend over and around end portions of the arms and bearthereagainst to limit the maximum diameter to which the outer ends ofthe arms can extend, and abrasive elements operatively mounted on theouter ends of each of said arms.

6. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms adapted for longitudinalflexing radially of said shank and being loosely mounted upon the headat their inner ends, a tubular sleeve shiftably mounted upon the shank,means on the shank for shifting the tubular sleeve axially with respectto the shank to various relative positions of adjustment therealong,said sleeve being adapted, when in such shifted positions, to extendover and around end portions of the arms and bear thereagainst to limitthe maximum diameter to which the outer ends of the arms can extend, andabrasive elements swivelly mounted on the outer ends of each of saidarms.

7. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms adapted 'for longitudinalflexing radially of said shank and being loosely mounted upon the head,a tubular sleeve having an axially extending non-cylindrical sectionshifta'bly mounted upon the shank, means on the shank for shifting thetubular sleeve axially with respect to the shank to various relativepositions of adjustment therealong, said sleeve being adapted, when insuch shifted positions, to extend over and around end portions of thearms and bear thereagainst to limit the maximum diameter to which theouter ends of the arms can extend, and abrasive elements swivellymounted on the outer ends of each of said arms.

8. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms adapted for longitudinalflexing radially of said shank and being loosely mounted upon the head,a tubular sleeve'shiftably mounted upon the shank, a nut threadedlymounted on the shank for shifting the tubular sleeve axially withrespect to the shank to various relative positions of adjustmenttherealong, said sleeve being adapted, when in such shifted positions,to extend over and around end portions of the arms and bear thereagainstto limit the maximum diameter to which the outer ends of the arms canextend, and abrasive elements swivelly mounted on the outer ends of eachof said arms.

9. A cylinder hone comprising an elongated shank having an axiallyprojecting head, a plurality of resilient arms loosely mounted upon thehead, a tubular sleeve having an axially extending non-cylindricalsection shiftably mounted upon the shank, means on the shank forshifting the tubular .sleeve axially with respect to the shank tovarious relative positions of adjustment therealong, saidnon-cylindrical section being provided with radially inwardly projectingears for sliding engagement with the head whereby to prevent rotation ofthe sleeve as it is shifted axially with respect to the head, saidsleeve being adapted, when in such shifted positions, to extend over andaround end portions of the arms and bear thereagainst to limit themaximum diameter to which the .outer ends .of the arms can extend, andabrasive elements operatively mounted on the outer ends of each of saidarms.

10. A honing tool comprising an elongated rod-like shaft integrallyincluding an intermediate threaded section integrally enjoined to oneend by an axial shank and at its other end by an axially projecting headhaving a plurality of axially extending flat faces and an outwardlyprojecting tapered terminal section, short radial pins mounted in andprojecting outwardly from at least some of the flat faces of the head, anut rotatably mounted upon the threaded section, a sleeve journaled atone end upon the nut and extending axially forwardly therefrom aroundthe head for longitudinally shiftable movement around the head, aplurality of resilient arms each provided at one end with an aperturefor loose-fitting disposition upon one of said pins, one of said armsbeing removably and loosely disposed upon each of said pins and held insubstantially floating disposition thereon by the sleeve, said sleevealso being in endwise engagement with outwardly presented faces of thearms for limiting the maximum diameter of the position assumed by theouter ends of the arms, and an abrasive honing element operativelymounted on the outer end of each of said arms.

11. A honing tool comprising an elongated rod-like shaft integrallyincluding an intermediate threaded section integrally enjoined to oneend by an axial shank and at its other end by an axially projecting headhaving a plurality of axially extending flat faces and an outwardlyprojecting tapered terminal section, short radial pins mounted in andprojecting outwardly from alternate flat faces of the head, a nutrotatably mounted upon the threaded section, a sleeve journaled at oneend upon the nut and extending axially forwardly therefrom around thehead for longitudinally shiftable movement around the head, a pluralityof resilient arms each provided at one end with an aperture forloose-fitting disposition upon one of said pins, one of said arms beingremovably and loosely disposed upon each of said pins and held insubstantially floating disposition thereon by the sleeve, said sleevealso being in endwise engagement with outwardly presented faces of thearms for limiting the maximum diameter of the position assumed by theouter ends of the arms, and an abrasive honing element operativelymounted on the outer end of each of said arms.

References Cited in the file of this patent UNITED STATES PATENTS1,647,133 Jennings Nov. 1, 1927 2,637,953 Billeter May 12, 19532,736,146 Brooks Feb. 28, 1956

